|Title of a book or other document.
|Command name or qualified command
|Commands and other text that you
displayed by the computer.
The name of a keyboard key. Note
that Return and Enter both refer
to the same key. A sequence such as Ctrl+A indicates
that you must hold down the key labeled Ctrl while
pressing the A key.
|The name of an environment variable,
for example PATH or errno.
A value that you replace
in a command or function, or information in a display that represents
several possible values.
|Manual page (manpage). In this example, “find”
is the manpage name and “1” is the manpage section.